Radio-over-fiber communication apparatus, system and method

Abstract

The embodiments of the present application relate to the technical field of radio communications. Provided are a radio-over-fiber communication apparatus, system and method. The radio-over-fiber communication apparatus comprises: an aggregation module, which is coupled to a remote radio head and is used for adjusting the baud rate of a feedback signal to obtain a compatible signal, combining the compatible signal and a received signal, so as to obtain an aggregated signal, and transmitting the aggregated signal by means of an optical fiber link, wherein the feedback signal is used for performing nonlinear compensation on a transmitted signal, and the frequency null of the compatible signal overlaps the frequency point of the received signal; and a splitting module, which is coupled to a baseband unit and is used for acquiring the aggregated signal by means of the optical fiber link, and splitting the aggregated signal into two signals, wherein the two signals are respectively used for the baseband unit to acquire the received signal and the feedback signal. In the solution provided in the present application, existing optical fiber resources in a radio-over-fiber communication system can be used to reduce the cost and power consumption of the system.

Description

Optical wireless communication devices, systems and methods

[0001] This application claims priority to Chinese Patent Application No. 202411001980.7, filed on July 24, 2024, entitled "Optical Wireless Communication Apparatus, System and Method", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of wireless communication technology, and in particular to an optical wireless communication device, system and method. Background Technology

[0003] With the development of communication technology, radio over fiber (ROF) is widely used in fiber optic connections between baseband units (BBUs) and remote radio heads (RRHs) in communication systems. ROF can modulate wireless radio frequency signals onto lasers and transmit them through fiber optic links, offering advantages such as reduced transmission losses in communication systems and allowing for more flexible layouts.

[0004] In a communication system, after the wireless signal is transmitted from the BBU side to the RRH side, it is amplified by the power amplifier (PA) on the RRH side before being transmitted into the air interface to reduce signal loss. Typically, on the BBU side, a digital pre-distortion (DPD) module is used to obtain the signal amplified by the PA through a feedback channel as a feedback signal. This feedback signal is then used to perform nonlinear compensation on the wireless signal to suppress the negative impact of the PA on the signal (such as nonlinear properties) or to increase the PA's transmit power.

[0005] However, in communication systems using ROF, the aforementioned feedback channel is in the form of an optical fiber link, which requires additional optical modules and optical devices, resulting in increased hardware costs and power consumption. Summary of the Invention

[0006] To address the aforementioned technical problems, this application provides an optical wireless communication device, system, and method. This optical wireless communication device combines the feedback signal and the received signal into a single signal for transmission by adjusting the baud rate of the feedback signal. This allows for the utilization of existing optical fiber resources in the optical wireless communication system, reducing the system's cost and power consumption.

[0007] In a first aspect, this application provides an optical wireless communication device applied to an optical wireless communication system including a baseband unit, a radio frequency unit, and an optical fiber link. The optical fiber link is used by the radio frequency unit to transmit received signals received from the air interface to the baseband unit, and by the baseband unit to transmit transmitted signals transmitted to the air interface. The device includes: an aggregation module coupled to the radio frequency unit, used to adjust the baud rate of the feedback signal to obtain a fused signal, merging the fused signal and the received signal to obtain an aggregated signal, and transmitting the aggregated signal through the optical fiber link; wherein the feedback signal is used to perform nonlinear compensation on the transmitted signal, and the frequency zero of the fused signal overlaps with the frequency of the received signal; and a splitting module coupled to the baseband unit, used to acquire the aggregated signal through the optical fiber link and split the aggregated signal into two signals, wherein the two signals are respectively used by the baseband unit to acquire the received signal and the feedback signal.

[0008] In this embodiment, the aggregation module adjusts the baud rate of the feedback signal from the radio frequency unit side to obtain a fused signal. The frequency zero of this fused signal overlaps with the frequency of the received signal, thus merging the received signal obtained by the radio frequency unit from the air interface and the fused signal into a single aggregated signal, ensuring that they do not interfere with each other. Based on this, the aggregation module can transmit the aggregated signal to the baseband unit side via the optical fiber link used for transmitting the received signal. The splitting module in this device can process the aggregated signal from the baseband unit side into two signals based on different power levels. These two signals are used for the baseband unit to obtain the received signal and the feedback signal, respectively. In this way, the communication system using ROF, i.e., the wireless optical communication system, can achieve communication without adding additional optical modules and optical fiber resources for transmitting the feedback signal, thereby significantly reducing hardware and transmission costs. In addition, this embodiment utilizes existing optical fiber resources for transmitting the received signal, which can significantly reduce the deployment difficulty of optical fiber resources. It can be seen that the optical wireless communication device provided in this embodiment can aggregate the receiving channel and the feedback channel, thereby reducing system cost and power consumption.

[0009] According to the first aspect, the zero point of the feedback signal frequency is located at N times the baud rate, where N is an integer greater than or equal to 1; the aggregation module is specifically used to: adjust the baud rate of the feedback signal to one-N times the frequency of the received signal to obtain a fused signal.

[0010] In this embodiment, the zero point of the feedback signal is located at N times the baud rate. Correspondingly, the baud rate of the feedback signal is set to one-Nth of the frequency of the received signal, thereby ensuring that the zero point of the feedback signal overlaps with the frequency of the received signal. In this way, the feedback signal and the received signal can be merged into a single aggregated signal without interference, utilizing existing optical fiber resources for transmission, significantly reducing the cost and power consumption of the communication system.

[0011] According to the first aspect, or any implementation of the first aspect above, the radio frequency unit is coupled with a serial deserializer and a low-noise amplifier for outputting the received signal; the aggregation module includes a combiner coupled to the serial deserializer and the low-noise amplifier respectively; the aggregation module is specifically used to: adjust the baud rate of the feedback signal through the serial deserializer to obtain a mergeable signal and transmit it to the combiner; the combiner is used to acquire the mergeable signal output by the serial deserializer and the received signal output by the low-noise amplifier, merge the mergeable signal and the received signal to obtain a single aggregated signal, and transmit the aggregated signal to the optical fiber link.

[0012] In this embodiment, the aggregation module combines the merging signal and the received signal into a single signal by a combiner coupled between the serial deserializer and the low-noise amplifier for outputting the received signal. This ensures that the aggregated signal can be transmitted through the existing fiber optic link in the base station used for transmitting the received signal, thereby significantly reducing the cost and power consumption of the communication system.

[0013] According to the first aspect, or any implementation of the first aspect above, the baseband unit is coupled with a first filtering module and a second filtering module, and the first filtering module and the second filtering module are respectively coupled with a splitter module; the splitter module is specifically used for:

[0014] The aggregated signal is divided into a first signal and a second signal; the first signal is transmitted to the first filtering module for processing to obtain a feedback signal; the second signal is transmitted to the second filtering module for processing to obtain a received signal.

[0015] In this embodiment, two signals are processed separately using different filtering modules to obtain corresponding feedback and received signals, which can further improve the efficiency of the communication system. Furthermore, when the second filtering module is an existing anti-aliasing ROC in the baseband unit, the second signal can be directly input to the ROC, thus reusing the anti-aliasing filter and further reducing costs.

[0016] Secondly, this application provides an optical wireless communication system, which includes a radio frequency (RF) unit and a baseband unit coupled through an optical fiber link. The RF unit is used to acquire a received signal from an air interface and a transmitted signal from the baseband unit through the optical fiber link, acquire a feedback signal for nonlinear compensation of the transmitted signal, adjust the baud rate of the feedback signal to obtain a fused signal, merge the fused signal and the received signal to obtain an aggregated signal, and transmit the aggregated signal through the optical fiber link, wherein the frequency zero point of the fused signal overlaps with the frequency point of the received signal. The baseband unit is used to acquire the aggregated signal from the RF unit through the optical fiber link, divide the aggregated signal into a first signal and a second signal, acquire a feedback signal based on the first signal, and acquire a received signal based on the second signal.

[0017] According to the second aspect, the zero point of the feedback signal frequency is located at N times the baud rate, where N is an integer greater than or equal to 1; the radio frequency unit is specifically used to: adjust the baud rate of the feedback signal to one-N times the frequency of the received signal to obtain a fused signal.

[0018] According to the second aspect, or any implementation of the second aspect above, the radio frequency unit is coupled with a serial deserializer, a low-noise amplifier, and a combiner, with the serial deserializer, the low-noise amplifier, and the fiber optic link respectively coupled to the combiner; the radio frequency unit is specifically used for: adjusting the baud rate of the feedback signal through the serial deserializer to obtain a mergeable signal, and transmitting the mergeable signal to the combiner; transmitting the received signal to the combiner through the low-noise amplifier; and combining the mergeable signal output by the serial deserializer and the received signal output by the low-noise amplifier into a single aggregated signal through the combiner, and transmitting the aggregated signal to the fiber optic link.

[0019] According to the second aspect, or any implementation of the second aspect above, the baseband unit is coupled with a first filtering module, a second filtering module, and a splitter module, with the first filtering module and the second filtering module respectively coupled to the splitter module; the baseband unit is specifically used for: splitting the aggregated signal into a first signal and a second signal through the splitter module; transmitting the first signal to the first filtering module for processing to obtain a feedback signal; and transmitting the second signal to the second filtering module for processing to obtain a received signal.

[0020] Thirdly, this application provides a communication method that can be executed by a radio frequency (RF) unit or a module (such as a chip) or aggregation module within the RF unit. The method includes: acquiring a feedback signal from the RF unit, the feedback signal being used to perform nonlinear compensation on a transmitted signal from a baseband unit; the RF unit being coupled to the baseband unit via an optical fiber link, the optical fiber link being used to transmit a received signal acquired by the RF unit from the air interface to the baseband unit; adjusting the baud rate of the feedback signal to obtain a fused signal, and merging the fused signal and the received signal into a single aggregated signal, wherein the frequency zero of the fused signal overlaps with the frequency of the received signal; and transmitting the aggregated signal to the baseband unit via the optical fiber link, the aggregated signal being used by the baseband unit to acquire the feedback signal and the received signal.

[0021] According to the third aspect, the zero point of the feedback signal frequency is located at N times the baud rate, where N is an integer greater than or equal to 1; adjusting the baud rate of the feedback signal to obtain a fusionable signal includes: adjusting the baud rate of the feedback signal to one-N times the frequency of the received signal to obtain a fusionable signal.

[0022] According to the third aspect, or any implementation of the third aspect above, adjusting the baud rate of the feedback signal to obtain a fusionable signal includes: adjusting the baud rate of the feedback signal through a serial deserializer to obtain a fusionable signal; merging the fusionable signal and the received signal into a single aggregated signal includes: merging the fusionable signal from the serial deserializer and the received signal into a single aggregated signal through a combiner.

[0023] The third aspect and any implementation thereof correspond to the first aspect and any implementation thereof, respectively. The technical effects of the third aspect and any implementation thereof are similar to those of the first aspect and any implementation thereof, and will not be repeated here.

[0024] Fourthly, this application provides a communication method that can be executed by a baseband unit or a module (such as a chip) or splitter module within the baseband unit. The method includes: acquiring an aggregated signal from a radio frequency (RF) unit via an optical fiber link; the aggregated signal being a signal obtained by combining a received signal acquired by the RF unit from an air interface and a fusionable signal; the frequency zero of the fusionable signal overlapping with the frequency of the received signal; the fusionable signal being a signal obtained by adjusting the baud rate of a feedback signal from the RF unit; the feedback signal being used for nonlinear compensation of a transmitted signal from the baseband unit; dividing the aggregated signal into a first signal and a second signal; acquiring the feedback signal based on the first signal; and acquiring the received signal based on the second signal.

[0025] According to the fourth aspect, the aggregated signal is divided into a first signal and a second signal, including: dividing the aggregated signal into a first signal and a second signal through a splitting module; obtaining a feedback signal based on the first signal and obtaining a received signal based on the second signal, including: processing the first signal through a first filtering module to obtain a feedback signal; and processing the second signal through a second filtering module to obtain a received signal.

[0026] The fourth aspect and any implementation thereof correspond to the first aspect and any implementation thereof, respectively. The technical effects of the fourth aspect and any implementation thereof can be found in the technical effects of the first aspect and any implementation thereof, as described above, and will not be repeated here.

[0027] Fifthly, this application provides an optical wireless communication method, which can be executed by an optical wireless communication system or a module (such as a chip) within the optical wireless communication system. The method includes: acquiring a received signal and a feedback signal, wherein the received signal is a signal from an air interface, and the feedback signal is used to perform nonlinear compensation on a transmitted signal acquired from a baseband unit via an optical fiber link; adjusting the baud rate of the feedback signal to obtain a fused signal, wherein the frequency zero of the fused signal overlaps with the frequency of the received signal; merging the fused signal and the received signal to obtain an aggregated signal, and transmitting the aggregated signal to the baseband unit via an optical fiber link; dividing the aggregated signal into a first signal and a second signal, wherein the first signal is used to provide a feedback signal to the baseband unit, and the second signal is used to provide a received signal to the baseband unit.

[0028] According to the fifth aspect, the zero point of the feedback signal frequency is located at N times the baud rate, where N is an integer greater than or equal to 1; the radio frequency unit is specifically used to: adjust the baud rate of the feedback signal to one-N times the frequency of the received signal to obtain a fused signal.

[0029] According to the fifth aspect, or any implementation of the fifth aspect above, the radio frequency unit is coupled with a serializer, a low-noise amplifier, and a combiner, wherein the serializer, the low-noise amplifier, and the optical fiber link are respectively coupled to the combiner; adjusting the baud rate of the feedback signal to obtain a mergeable signal includes: adjusting the baud rate of the feedback signal through the serializer to obtain a mergeable signal, and transmitting the mergeable signal to the combiner; merging the mergeable signal and the received signal to obtain a single aggregated signal includes: transmitting the received signal to the combiner through the low-noise amplifier; and merging the mergeable signal output by the serializer and the received signal output by the low-noise amplifier into a single aggregated signal through the combiner.

[0030] According to the fifth aspect, or any implementation of the fifth aspect above, the baseband unit is coupled with a first filtering module, a second filtering module, and a splitter module, with the first filtering module and the second filtering module respectively coupled to the splitter module; dividing the aggregated signal into a first signal and a second signal includes: dividing the aggregated signal into a first signal and a second signal through the splitter module; transmitting the first signal to the first filtering module for processing to obtain a feedback signal; and transmitting the second signal to the second filtering module for processing to obtain a received signal.

[0031] The fifth aspect and any implementation thereof correspond to the first aspect and any implementation thereof, respectively. The technical effects of the fifth aspect and any implementation thereof are similar to those of the first aspect and any implementation thereof, and will not be repeated here.

[0032] Sixthly, this application provides a chip including one or more processors, the processors being configured to process data and / or information such that the methods described in the third aspect or any possible implementation thereof are implemented, the methods described in the fourth aspect or any possible implementation thereof are implemented, and the methods described in the fifth aspect or any possible implementation thereof are implemented. Optionally, the communication device may further include a communication interface or interface circuitry, the communication interface or interface circuitry being configured to receive data and / or information and transmit the received data and / or information to the processor. Optionally, the communication interface may also be configured to output the data and / or information processed by the processor. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 is a framework example diagram of an optical wireless communication system;

[0035] Figure 2 is a schematic diagram of a digital predistortion feedback channel in an optical wireless communication system;

[0036] Figure 3 is an example diagram of an application scenario of the optical wireless communication device provided in the embodiments of this application;

[0037] Figure 4 is an example architecture diagram of an optical wireless communication system provided in an embodiment of this application;

[0038] Figure 5 is an example diagram of the processing procedure of the optical wireless communication method provided in the embodiments of this application;

[0039] Figure 6 is a flowchart illustrating an optical wireless communication method provided in an embodiment of this application;

[0040] Figure 7 is one of the example frame structures of the optical wireless communication device provided in the embodiments of this application;

[0041] Figure 8 is one of the example frame structures of the optical wireless communication device provided in the embodiments of this application. Detailed Implementation

[0042] The technical solutions in the embodiments of this application will be described below with reference to the accompanying drawings. It should be understood that in this application, the indication includes direct indication (also called explicit indication) and implicit indication. Direct indication information A refers to information A; implicit indication information A refers to indicating information A through the correspondence between information A and information B and the direct indication information B. The correspondence between information A and information B can be predefined, pre-stored, pre-burned, or pre-configured.

[0043] It should be understood that in this application, information C is used to determine information D, including both situations where information D is determined solely based on information C and situations where it is determined based on information C and other information. Furthermore, information C can also be used to determine information D indirectly, for example, where information D is determined based on information E, and information E is determined based on information C.

[0044] Furthermore, in the embodiments of this application, "network element A sends information A to network element B" can be understood as network element B being the destination of information A or an intermediate network element in the transmission path between the destination and network element B, which may include sending information directly or indirectly to network element B. "Network element B receives information A from network element A" can be understood as network element A being the source of information A or an intermediate network element in the transmission path between the source and network element A, which may include receiving information directly or indirectly from network element A. Information may undergo necessary processing between the source and destination, such as format changes, but the destination can understand the valid information from the source. Similar expressions in this application can be understood in a similar way and will not be elaborated further here.

[0045] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0046] The terms "first" and "second," etc., used in the specification and claims of this application are used to distinguish different objects, not to describe a specific order of objects. For example, "first target object" and "second target object," etc., are used to distinguish different target objects, not to describe a specific order of target objects.

[0047] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0048] In the description of the embodiments in this application, unless otherwise stated, "multiple" means two or more. For example, multiple processing units means two or more processing units; multiple systems means two or more systems.

[0049] To facilitate understanding of this embodiment, some technical terms and background technologies involved in this embodiment will be introduced first:

[0050] (1) Radio over fiber (ROF): ROF is a technology that modulates radio frequency signals onto a laser and transmits them through an optical fiber link. In an ROF system, the radio frequency signal is converted into an optical signal at a central station and then transmitted to the base station via optical fiber. At the base station, the optical signal is converted back into a radio frequency signal and then radiated out through an antenna. Therefore, in an ROF system, analog radio frequency signals are transmitted through the optical fiber.

[0051] (2) Digital Predistortion (DPD): DPD is a linearization technique generally used to improve the efficiency of power amplifiers (PAs) in wireless communication systems. PAs exhibit severe nonlinear effects when operating in high-output-power mode, therefore a DPD module is needed in the pre-stage of the PA to counteract these adverse effects. Within the DPD module, the DPD algorithm needs to accurately and efficiently model the PA behavior to ensure successful DPD deployment.

[0052] (3) Nonlinear effect: This refers to the situation where the output signal exhibits nonlinear properties due to the influence of PA power. Nonlinearity means that there is a nonlinear relationship between the input and output signals, which does not satisfy the superposition principle. Nonlinearity is generally an unfavorable effect and needs to be suppressed or compensated, i.e., nonlinear compensation. For example, a DPD module can be used to suppress or compensate for nonlinearity.

[0053] (4) Baseband unit (BBU): In the base station, it is used to process the raw information and send the processed information to the remote radio head (RRH) to generate radio signals, as well as extract information from the received signals received by the RRU and the feedback signals provided by the RRU.

[0054] (5) Radio Frequency Unit (RRH): Used in the base station for signal generation and extraction. Specifically, the radio signals generated by the RRU are sent to terminal devices such as mobile phones through the antenna. Conversely, the signals sent by the terminal devices are also received by the RRU through the antenna, and after preliminary processing by the RRU, they finally reach the BBU to extract information.

[0055] (6) Serializer / Deserializer (SerDes): Also known as a serializer / deserializer, it is an interface circuit used in high-speed data communication. The serializer provides a mainstream time-division multiplexing (TDM) and point-to-point (P2P) serial communication technology. Specifically, at the transmitting end, the serializer converts multiple low-speed parallel signals into high-speed serial signals. After transmission through the medium (optical fiber or copper wire), the high-speed serial signals are finally converted back into low-speed parallel signals at the receiving end. This point-to-point serial communication technology fully utilizes the channel capacity of the transmission medium, reduces the required transmission channels and the number of device pins, and increases the signal transmission speed, thereby significantly reducing communication costs.

[0056] (7) Duplexer: The duplexer is a key component of multi-frequency duplex radios and repeaters. Its function is to isolate the transmitted and received signals, ensuring that both transmission and reception can work normally at the same time. It consists of two sets of bandpass filters of different frequencies to prevent the transmitted signal from the local unit from being transmitted to the receiver.

[0057] (8) Low-noise amplifier (LNA): A low-noise amplifier is an amplifier with a very low noise figure. It is generally used as a high-frequency or intermediate-frequency preamplifier in various radio receivers, as well as an amplifier circuit in high-sensitivity electronic detection equipment. In the case of amplifying weak signals, the noise of the amplifier itself may seriously interfere with the signal, so it is desirable to reduce this noise in order to improve the signal-to-noise ratio of the output.

[0058] (9) Power amplifier (PA): Used to amplify the power of radio frequency signals to a sufficient amount of radio frequency power to feed the radio frequency signals to the antenna for radiation.

[0059] (10) Radio on chip (ROC): A chip that converts radio frequency signals into digital signals or vice versa, thereby enabling wireless transmission of information.

[0060] (11) Circulator: A multi-port device that transmits incident waves entering any of its ports sequentially to the next port in a direction determined by a static polarization magnetic field. A circulator, also called an isolator, is a non-reversible device with several terminals. Its significant feature is its ability to transmit high-frequency signal energy in one direction. Circulators are classified into micro-optical fiber optics and electronic circulators, and have good applications in isolators, duplexers, and reflective amplifiers.

[0061] (12) Analog-to-digital converter (ADC): An analog-to-digital converter, also known as an A / D converter or simply ADC, is an electronic component that converts analog signals into digital signals. A typical ADC converts an input voltage signal into an output digital signal. Since digital signals themselves do not have practical meaning, but only represent a relative magnitude, any ADC needs a reference analog quantity as a conversion standard. A common reference standard is the magnitude of the largest convertible signal. The output digital quantity represents the magnitude of the input signal relative to the reference signal.

[0062] (13) Baud rate: Baud rate represents the number of symbolic units transmitted per unit time. It is a measure of the symbol transmission rate. It is expressed by the number of times the carrier modulation state changes per unit time. Baud rate refers to the number of symbols transmitted per unit time.

[0063] (14) Frequency point: refers to a specific absolute frequency value, generally the center frequency of the modulated signal. In one example, the frequency point can be a number assigned to a fixed frequency.

[0064] To facilitate understanding, the following example illustrates the current situation of optical wireless communication systems.

[0065] Figure 1 illustrates an example framework diagram of an optical wireless communication system. As shown in Figure 1, taking a multi-antenna optical wireless communication system as an example: For each transmitting channel, the baseband signal undergoes clipping, DPD (Digital Photodiode), and radio frequency chip (ROC) processing before electro-optical conversion to obtain the corresponding optical signal. The optical signals generated by each transmitting channel are located at different wavelengths, and they are subsequently wavelength-division multiplexed into a single optical fiber. After transmission through up to tens of kilometers of ROF fiber, the multi-wavelength optical signals are demultiplexed into multiple optical receiving modules. Each wavelength corresponds one-to-one with a specific receiving module. After photoelectric conversion by the receiving module, the resulting electrical signal is amplified in the PA (Power Amplifier). The amplified signal passes through a circulator into the antenna and is then radiated into the air.

[0066] To compensate for the nonlinear effects of the PA (Power Amplifier), the DPD (Digital Distribution Detector) module requires a feedback signal. This feedback signal is coupled out from the PA and then digitized by the ADC (Digital Converter). The digitized feedback signal ensures a sufficiently high signal-to-noise ratio, thus enabling a high-performance DPD. The digitized feedback signal is then converted into a multi-level analog signal using a SerDes (Series Deserializer), and subsequently passes through the optical transmitter module, wavelength division multiplexing (WDM), fiber optic transmission, WDM demultiplexing, and optical receiver module before reaching the BBU (Browser Unit). After passing through the SerDes again, the feedback signal enters the DPD module, ensuring its normal operation.

[0067] In addition to the transmit and feedback channels, the signal in the receive channel of the ROF system is also carried in optical fiber. In Figure 1, the signal received by the RRH-side antenna is converted into an optical signal after passing through a circulator and a low-noise amplifier (LNA). Similar to the transmit and feedback channels, the receive channel also requires an optical transmit module, wavelength division multiplexing (WDM), optical fiber transmission, wavelength division multiplexing (WDM), and an optical receive module. After the signal in the receive channel completes photoelectric conversion, it enters the ROC for processing, and then completes the corresponding baseband process.

[0068] For example, Figure 2 is a schematic diagram of a digital predistortion feedback channel in an optical-over-the-air (ROF) wireless communication system. As shown in Figure 2, in modern wireless communication networks, a base station consists of two parts: a baseband unit (BBU) and a radio frequency (RRH) unit, which are connected by optical fiber. This reduces transmission loss and allows for more flexible layout. Furthermore, by extending the optical fiber, the BBU can be migrated to a centralized BBU pool, enabling dynamic allocation of frequency resources and reducing installation and maintenance costs. In the optical fiber extension scenario, the optical fiber can carry wireless radio frequency signals, which simplifies the RRH structure and reduces the overall cost of the transmission system. This technology of modulating wireless radio frequency signals onto a laser and transmitting them in an optical fiber link is called optical-over-the-air (ROF). In wireless communication systems using ROF, the wireless signal is amplified by a power amplifier (PA) before being transmitted into the air interface by the radio frequency unit. The PA introduces strong nonlinearity into the signal. To suppress the effects of nonlinearity or increase the PA's transmission power, a digital predistortion feedback (DPD) module is generally used for nonlinearity compensation.

[0069] However, since the DPD module is located on the BBU side and the PA is located on the RRH side, the DPD module requires a signal from the PA as a feedback signal during operation. This is achieved through an additional feedback channel. The feedback channel needs to be transmitted via optical fiber, and the feedback signal used by the DPD is generally digitized to achieve a sufficiently high signal-to-noise ratio, thus ensuring DPD performance. Therefore, the feedback channel used by the DPD in a ROF-based wireless communication system uses additional optical modules and devices, increasing hardware costs and power consumption. Furthermore, the feedback channel requires new optical fiber resources, increasing deployment complexity.

[0070] Based on the above analysis, this application provides an optical-over-wireless communication device to solve the aforementioned problems. The aggregation module in this device adjusts the baud rate of the feedback signal on the radio frequency unit side to obtain a fused signal. The frequency zero point of this fused signal overlaps with the frequency point of the received signal, thus merging the received signal obtained by the radio frequency unit from the air interface and the fused signal into a single aggregated signal, ensuring that they do not interfere with each other. Based on this, the aggregation module can transmit the aggregated signal to the baseband unit side via the optical fiber link used for transmitting the received signal. The splitting module in this device can process the aggregated signal on the baseband unit side into two signals based on different power levels. These two signals are used for the baseband unit to obtain the received signal and the feedback signal, respectively. In this way, the communication system using ROF, i.e., the wireless optical-over-wireless communication system, can achieve communication without adding additional optical modules and optical fiber resources for transmitting the feedback signal, thereby significantly reducing hardware and transmission costs. Furthermore, this application utilizes existing optical fiber resources for transmitting the received signal, which can significantly reduce the deployment difficulty of optical fiber resources. Therefore, the optical-over-wireless communication device provided in this application can aggregate the receiving channel and the feedback channel, thereby reducing system cost and power consumption.

[0071] Before describing the technical solutions of the embodiments of this application, the application scenarios of the communication methods of the embodiments of this application will first be described with reference to the accompanying drawings. The embodiments of this application can be applied to ROF-based wireless communication systems, i.e., optical wireless communication systems. These wireless communication systems can be, for example, 5G or NR systems, long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, wireless local area network (WLAN) systems, satellite communication systems, future communication systems such as 6th generation (6G) mobile communication systems, or integrated systems of multiple systems. The technical solutions provided in this application can also be applied to device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, machine-to-machine (M2M) communication, machine-type communication (MTC), and Internet of Things (IoT) communication systems, etc.

[0072] For example, Figure 3 is an example diagram of an application scenario of the optical wireless communication device provided in this application embodiment. As shown in Figure 3, the optical wireless communication device can be applied to an optical wireless communication system including a baseband unit, a radio frequency unit, and an optical fiber link. The optical fiber link is used by the radio frequency unit to transmit received signals received from the air interface to the baseband unit, and by the baseband unit to transmit transmitted signals transmitted to the air interface to the radio frequency unit. The baseband unit, radio frequency unit, and optical fiber link can be used to form a base station. In this application embodiment, the base station can refer to a radio access network (RAN) node (or device) that connects terminal devices to a wireless network. A base station can broadly encompass, or be replaced by, various names including: NodeB, evolved NodeB (eNB), next-generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station, auxiliary station, motor slide retainer (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), radio unit (RU), positioning node, etc. A base station can be a macro base station, micro base station, relay node, donor node, or similar entities, or combinations thereof. A base station can also refer to a communication module, modem, or chip installed within the aforementioned equipment or apparatus. A base station can also be a mobile switching center, equipment performing base station functions in D2D, V2X, and M2M communications, network-side equipment in 6G networks, and equipment performing base station functions in future communication systems. A base station can support networks using the same or different access technologies. Optionally, a RAN node can also be a server, wearable device, vehicle, or in-vehicle equipment. For example, the access network equipment in vehicle-to-everything (V2X) technology can be a roadside unit (RSU). The embodiments of this application do not limit the specific technology or equipment form used in the base station.Among them, terminal equipment can also be called user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent, or user device.

[0073] In some deployments, the network devices mentioned in the embodiments of this application may be devices including CU, DU, or CU and DU, or devices with control plane CU nodes (central unit-control plane (CU-CP)) and user plane CU nodes (central unit-user plane (CU-UP)) and DU nodes. For example, the network devices may include gNB-CU-CP, gNB-CU-UP, and gNB-DU.

[0074] In some deployments, multiple RAN nodes collaborate to assist terminals in achieving wireless access, with different RAN nodes each implementing some of the base station's functions. For example, RAN nodes can be CUs, DUs, CU-CPs, CU-UPs, or RUs. CUs and DUs can be configured separately or included in the same network element, such as a BBU. RUs can be included in radio frequency equipment or radio frequency units, such as RRUs, AAUs, or RRHs.

[0075] In one possible design, the processing unit in the BBU used to implement baseband functions is called the baseband high (BBH) unit, and the processing unit in the RRU / AAU / RRH used to implement baseband functions is called the baseband low (BBL) unit.

[0076] The radio frequency (RF) unit and / or baseband unit can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; and they can also be deployed in the air on aircraft, balloons, and satellites. This application does not limit the scenario in which the RF unit and baseband unit are located. Furthermore, the baseband unit and RF unit can be hardware devices, or software functions running on dedicated hardware or general-purpose hardware, such as virtualization functions instantiated on a platform (e.g., a cloud platform), or entities that include dedicated or general-purpose hardware devices and software functions. This application does not limit the specific form of the baseband unit and RF unit.

[0077] In this embodiment, the device for implementing the function of the radio frequency (RF) unit can be the RF unit itself, or a device capable of supporting the RF unit in implementing that function, such as a chip system, hardware circuit, software module, or a hardware circuit plus a software module. This device can be installed in the RF unit or used in conjunction with the RF unit. In this embodiment, the RF unit is used as an example to illustrate the function of the RF unit, and this does not constitute a limitation on the solution of this embodiment.

[0078] In this embodiment, the device used to implement the function of the baseband unit can be the baseband unit itself, or it can be a device capable of supporting the baseband unit in implementing this function, such as a chip system. This device can be installed in a terminal device or used in conjunction with a terminal device. In this embodiment, the chip system can be composed of chips or may include chips and other discrete devices. This embodiment only uses the baseband unit as an example to illustrate the function of the baseband unit and does not limit the solution of this embodiment.

[0079] It should be noted that Figure 3 is a simplified schematic diagram for ease of understanding. For example, the optical wireless communication system may also include other devices, such as wireless relay devices and / or wireless backhaul devices, which are not shown in Figure 3. In practical applications, the optical wireless communication system may include multiple network devices or multiple terminal devices. This application does not limit the number of network devices and terminal devices included in the optical wireless communication system.

[0080] Referring again to Figure 3, this application embodiment provides an optical wireless communication device 300, applied to the optical wireless communication system shown in Figure 3, which includes a baseband unit, a radio frequency unit, and an optical fiber link. The device includes:

[0081] The aggregation module 3001, coupled to the radio frequency unit, is used to adjust the baud rate of the feedback signal to obtain a fused signal. The fused signal and the received signal are combined to obtain a single aggregated signal, which is then transmitted through an optical fiber link. The feedback signal is used to perform nonlinear compensation on the transmitted signal, and the frequency zero of the fused signal overlaps with the frequency of the received signal.

[0082] The splitter module 3002, coupled to the baseband unit, is used to acquire the aggregated signal through the optical fiber link and split the aggregated signal into two signals, which are used by the baseband unit to acquire the received signal and the feedback signal, respectively.

[0083] In practical applications, the aggregation module 3001 and the splitter module 3002 in the optical wireless communication device can be either separate or integrated, and this application embodiment does not impose any limitations on this. It is understood that, regardless of the form of the optical wireless communication device, the aggregation module 3001 and the splitter module 3002 can be coupled to the radio frequency unit and the baseband unit, respectively.

[0084] In one alternative implementation, the zero point of the feedback signal is located at N times the baud rate, where N is an integer greater than or equal to 1.

[0085] The aggregation module is specifically used for:

[0086] The baud rate of the feedback signal is adjusted to one-N times the frequency of the received signal to obtain a fused signal.

[0087] In this embodiment, the zero point of the feedback signal is located at N times the baud rate. Correspondingly, the baud rate of the feedback signal is set to one-Nth of the frequency of the received signal, thereby ensuring that the zero point of the feedback signal overlaps with the frequency of the received signal. In this way, the feedback signal and the received signal can be merged into a single aggregated signal without interference, utilizing existing optical fiber resources for transmission, significantly reducing the cost and power consumption of the communication system.

[0088] In one alternative implementation, the radio frequency unit is coupled with a serial deserializer and a low-noise amplifier for outputting the received signal; the aggregation module includes a combiner coupled to the serial deserializer and the low-noise amplifier, respectively.

[0089] Aggregation module 3001 is specifically used for:

[0090] The baud rate of the feedback signal is adjusted by the serial deserializer to obtain a mergeable signal, which is then transmitted to the combiner.

[0091] The combiner is used to acquire the mergeable signal output from the serializer and the received signal output from the low-noise amplifier, combine the mergeable signal and the received signal to obtain a single aggregated signal, and transmit the aggregated signal to the fiber optic link.

[0092] In this embodiment, the aggregation module combines the merging signal and the received signal into a single signal by a combiner coupled between the serial deserializer and the low-noise amplifier for outputting the received signal. This ensures that the aggregated signal can be transmitted through the existing fiber optic link in the base station used for transmitting the received signal, thereby significantly reducing the cost and power consumption of the communication system.

[0093] In one optional implementation, the baseband unit is coupled with a first filtering module and a second filtering module, and the first filtering module and the second filtering module are respectively coupled with the splitter module;

[0094] The 3002 branch module is specifically used for:

[0095] The aggregated signal is divided into a first signal and a second signal;

[0096] The first signal is transmitted to the first filtering module for processing to obtain a feedback signal;

[0097] The second signal is transmitted to the second filtering module for processing to obtain the received signal.

[0098] For example, the first and / or second filtering modules can be existing filtering modules in the baseband unit. Alternatively, if the baseband unit cannot provide filtering functionality for the first and / or second signals, the first and / or second signals can be filtering modules coupled to the baseband unit in the optical wireless communication device. In one example, still referring to Figure 3, the first filtering module can be a filter 3003 coupled to the combiner 3002 in the optical wireless communication device, and the filter 3003 can be coupled to the serializer / deserializer in the baseband unit. The second filtering module can be an existing ROC with anti-aliasing functionality in the baseband unit.

[0099] In this embodiment, two signals are processed separately using different filtering modules to obtain corresponding feedback and received signals, which can further improve the efficiency of the communication system. Furthermore, when the second filtering module is an existing anti-aliasing ROC in the baseband unit, the second signal can be directly input to the ROC, thus reusing the anti-aliasing filter and further reducing costs.

[0100] In this embodiment, the device used to implement the function of the optical-borne wireless communication device can be an optical-borne wireless communication device itself, or a device capable of supporting the optical-borne wireless communication device in implementing this function, such as a chip system. This device can be installed in a base station or used in conjunction with a base station. In this embodiment, the chip system can be composed of chips or may include chips and other discrete components. This embodiment only uses the optical-borne wireless communication device as an example to illustrate the function of the optical-borne wireless communication device, and does not constitute a limitation on the solution of this embodiment.

[0101] For ease of understanding, the optical wireless communication device and system provided in the embodiments of this application will be described in detail below with reference to Figures 4 and 5.

[0102] For example, Figure 4 is an architectural example diagram of an optical wireless communication system provided in an embodiment of this application. As shown in Figure 4, the optical wireless communication system 400 may include: a radio frequency unit 4001 and a baseband unit 4002 coupled through an optical fiber link 4003;

[0103] The radio frequency unit 4001 is used to acquire the received signal from the air interface and the transmitted signal from the baseband unit 4002 through the optical fiber link 4003, acquire the feedback signal for nonlinear compensation of the transmitted signal, adjust the baud rate of the feedback signal to obtain a fused signal, merge the fused signal and the received signal to obtain a single aggregated signal, and transmit the aggregated signal through the optical fiber link 4003, wherein the frequency zero point of the fused signal overlaps with the frequency point of the received signal;

[0104] The baseband unit 4002 is used to acquire the aggregated signal from the radio frequency unit 4001 through the optical fiber link 4003, and divide the aggregated signal into a first signal and a second signal, acquire a feedback signal based on the first signal, and acquire a received signal based on the second signal.

[0105] In practical applications, the transmitted or received signal in a wireless communication system using ROF is located at a certain frequency point, such as f. RF A narrowband analog signal is located nearby, while the feedback signal is a wideband analog signal equivalent to a multi-level digital signal. The spectral zeros of the feedback signal are located at integer multiples of its baud rate, such as Baud. Thus, by setting the Baud of the feedback signal to f on the RRH side... RF Using fixed values ​​such as 1x, 1 / 2x, or 1 / 4x, the narrowband received signal is positioned precisely near the spectral null point of the feedback signal, i.e., overlapping as shown in Figure 4. Furthermore, the received and feedback signals are power-combined on the RRH side and transmitted together via optical fiber from the RRH side to the BBU side, completing the aggregation of the receive and feedback channels. On the BBU side, the aggregated received and feedback signals are first power-splittered, with one path being filtered out by a filter located at f... RF The narrowband signal is then used as a feedback signal to enter SerDes for subsequent DPD operations. Another signal, in the presence of an anti-aliasing filter in the ROC, can be used as the received signal to enter the ROC for subsequent processing. The out-of-band components of the narrowband received signal are filtered out by the anti-aliasing filter, without affecting the ROC and baseband processing.

[0106] It is understandable that the arrows connecting different components in Figures 3 and 4 represent coupling between the connected components. This coupling can occur through media such as fiber optic links, wires, or electromagnetic waves, and the specific method can be configured according to application requirements. For example, in an optical wireless communication system, the radio frequency unit and the baseband unit are coupled via a fiber optic link. The direction of the arrows in these lines indicates the transmission direction of signals, data, and signaling between different components.

[0107] For ease of understanding and description, the following explanation will use an optical wireless communication system as an example.

[0108] For example, Figure 5 is an example diagram of the processing procedure of the optical wireless communication method provided in the embodiments of this application. As shown in Figure 5, the method is described as being applied to a four-transmitter, four-receiver optical wireless communication system. The processing of the aggregation feedback signal and the received signal in the wireless communication system using the optical wireless communication method or optical wireless communication device provided in the embodiments of this application includes the following processes (1) to (11):

[0109] (1) Each transmitted signal on the BBU side is processed sequentially by baseband, clipping, DPD, and ROC, and then electro-optical converted by the optical transmitter module. The resulting multi-wavelength optical signals are all different. After wavelength division multiplexing, the multi-wavelength optical signals enter a single optical fiber and are transmitted to the RRH side.

[0110] (2) In RRH, multi-wavelength optical signals are first demultiplexed and distributed to multiple optical receiving modules. Each wavelength corresponds to one optical receiving module. After the optical receiving module completes photoelectric conversion, each electrical signal passes through the PA and circulator, and is then radiated into the air port through the antenna.

[0111] (3) The signal received by the antenna is amplified by the LNA after passing through the circulator.

[0112] (4) For the DPD feedback channel, a portion of the signal needs to be coupled out from the PA and then sampled by the ADC. The resulting serial bit stream is converted by SerDes into an analog signal that can be regarded as a multi-level digital signal. In terms of the spectrum, it is a wideband signal.

[0113] (5) Both the transmitted and received signals are narrowband signals in terms of their frequency spectrum, and both are located at a certain frequency, such as f. RF Nearby. The spectral zeros of each feedback signal are located at integer multiples of the baud rate, such as Baud, 2 times Baud, 3 times Baud, etc. Based on this, SerDes sets Baud to f RF Using fixed values ​​such as 1x, 1 / 2x, or 1 / 4x can ensure that the zero point of the feedback signal spectrum is located at frequency f. RF Nearby, that is, with f RF overlapping.

[0114] (6) Use a combiner to aggregate the multi-level broadband feedback signal output by the SerDes and the narrowband received signal output by the LNA. The combiner is generally used at the transmitting end. Its function is to combine two or more radio frequency signals from different transmitters into one signal and send it to the radio frequency device for antenna transmission, while avoiding mutual interference between the signals at each port.

[0115] (7) Using the optical transmitting module, wavelength division multiplexer, optical fiber, wavelength division multiplexer and optical receiving module, the multi-channel aggregated signal, that is, the aggregated signal corresponding to each transmit and receive in the above four transmit and four receive scenario, is transmitted to the BBU side.

[0116] (8) Each aggregated signal on the BBU side is split into two signals according to power by a splitter. The first signal enters the filter to filter out the narrowband received signal, and the filtered result is used as a feedback signal to enter the SerDes and DPD to complete subsequent operations. The second signal can be directly entered into the ROC as a received signal.

[0117] (9) In ROC, the signal first comes from f RF The signal is down-converted to zero frequency and then enters an anti-aliasing filter. The anti-aliasing filter removes out-of-band components, and the signal is then sampled by the ADC for baseband use. This way, out-of-band components do not affect signal reception. In one example, a ROC without anti-aliasing filtering can be used; in this case, a filter can be coupled between the ROC and the baseband to remove out-of-band components.

[0118] In summary, in this embodiment, the received signal and the feedback signal are aggregated at the RRH side. The aggregated signal is transmitted through a set of optical modules and optical fibers to the BBU side, where it is then deaggregated and subjected to corresponding receiving or feedback processing. Thus, the solution provided in this embodiment saves one-third of the optical module cost, specifically including the laser, detector, wavelength division multiplexer, and demultiplexer, and also saves one-third of the optical fiber resources, effectively reducing the power consumption and size of the optical module.

[0119] It is understood that the optical wireless communication system with more or fewer transceiver antennas is similar to the embodiment in Figure 6, except that the number of transceiver antennas is different and the number of related components is adjusted accordingly. For the same parts, please refer to the description of the embodiment in Figure 6, which will not be repeated here.

[0120] Figure 6 is a flowchart illustrating an optical wireless communication method provided in an embodiment of this application. As shown in Figure 6, this method can be applied to the optical wireless communication device shown in Figure 3, or the optical wireless communication system shown in Figure 4. The method includes:

[0121] S601, acquires feedback signal from RF unit, feedback signal is used to perform nonlinear compensation on transmit signal from baseband unit, RF unit is coupled to baseband unit through fiber optic link, fiber optic link is used to transmit received signal acquired by RF unit from air interface to baseband unit.

[0122] S602, adjust the baud rate of the feedback signal to obtain a fusionable signal, and merge the fusionable signal and the received signal into a single aggregated signal, wherein the frequency zero point of the fusionable signal overlaps with the frequency point of the received signal;

[0123] S603 transmits the aggregated signal to the baseband unit via an optical fiber link;

[0124] S604 divides the aggregated signal into a first signal for providing feedback signals and a second signal for providing received signals.

[0125] It is understood that the execution subject of each step in the method shown in Figure 6 corresponds to the component used to achieve the same function in the embodiments of Figure 3 and Figure 4. The specific implementation of the embodiment of Figure 6 is similar to that in the embodiments of Figure 3 and Figure 4 above. The difference is that the specific execution subject depends on the device / system that applies the method. For the same content, please refer to the existing description in the embodiments of Figure 3 and Figure 4, which will not be repeated here.

[0126] For example, FIG7 is one of the example structural diagrams of an optical wireless communication device provided in an embodiment of this application. As shown in FIG7, the communication device 700 includes a processing unit 7001 and a transceiver unit 7002. The communication device 700 is used to implement the functions of a terminal or base station in the above method embodiments.

[0127] For example, FIG8 is one of the example structural diagrams of an optical wireless communication device provided in an embodiment of this application. As shown in FIG8, the communication device 800 includes a processor 8001 and an interface circuit 8002. The processor 8001 and the interface circuit 8002 are coupled to each other. It is understood that the interface circuit 8002 can be a transceiver or an input / output interface. Optionally, the communication device 800 may further include a memory 1430 for storing instructions executed by the processor 8001, or storing input data required by the processor 8001 to execute instructions, or storing data generated after the processor 8001 executes instructions.

[0128] It is understood that Figures 7 and 8 are schematic diagrams of possible chip systems provided in the embodiments of this application. These chip systems can be used to implement the functions of the optical wireless communication device in the above method embodiments, and therefore can also achieve the beneficial effects of the above optical wireless communication device embodiments, which will not be elaborated here.

[0129] Furthermore, the frameworks shown in Figures 3, 4, 7, and 8 of this application, in order to realize the functions of the communication methods described in the embodiments of this application, include hardware and / or software modules corresponding to the execution of each function. In conjunction with the method steps of the various examples described in the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in a manner that drives hardware or computer software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application in conjunction with the embodiments, but such implementation should not be considered beyond the scope of this application.

[0130] Any content in the various embodiments of this application, as well as any content in the same embodiment, can be freely combined. Any combination of the above content is within the scope of this application.

[0131] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An optical wireless communication device, comprising: Applied to an optical wireless communication system comprising a baseband unit, a radio frequency unit and an optical fiber link, the optical fiber link being used for transmitting a received signal received from an air interface from the radio frequency unit to the baseband unit and transmitting a transmitted signal transmitted to the air interface from the baseband unit to the radio frequency unit; the device comprises: an aggregation module coupled to the radio frequency unit, used for adjusting a baud rate of a feedback signal to obtain a mergable signal, merging the mergable signal and the received signal to obtain an aggregated signal, and transmitting the aggregated signal through the optical fiber link; wherein the feedback signal is used for nonlinear compensation of the transmitted signal, and a frequency zero point of the mergable signal overlaps with a frequency point of the received signal; a splitting module coupled to the baseband unit, used for obtaining the aggregated signal through the optical fiber link, and splitting the aggregated signal into two signals, wherein the two signals are respectively used for the baseband unit to obtain the received signal and the feedback signal.

2. The apparatus of claim 1, wherein, The frequency zero point of the feedback signal is located at N times of the baud rate, and N is an integer greater than or equal to 1; The aggregation module is specifically used for: adjusting the baud rate of the feedback signal to N times of the frequency point of the received signal to obtain the mergable signal.

3. The apparatus of claim 1 or 2, wherein, The radio frequency unit is coupled with a serial deserializer and a low noise amplifier used for outputting the received signal; the aggregation module comprises a combiner coupled with the serial deserializer and the low noise amplifier respectively; The aggregation module is specifically used for: adjusting the baud rate of the feedback signal through the serial deserializer to obtain the mergable signal and transmit the mergable signal to the combiner; The combiner is used for obtaining the mergable signal output by the serial deserializer and the received signal output by the low noise amplifier, merging the mergable signal and the received signal to obtain an aggregated signal, and transmitting the aggregated signal to the optical fiber link.

4. The apparatus of any one of claims 1 to 3, wherein, The baseband unit is coupled with a first filter module and a second filter module, and the first filter module and the second filter module are respectively coupled with the splitting module; The splitting module is specifically used for: splitting the aggregated signal into a first signal and a second signal; transmitting the first signal to the first filter module for processing to obtain the feedback signal; transmitting the second signal to the second filter module for processing to obtain the received signal.

5. An optical wireless communication system, characterized by The system comprises a radio frequency unit and a baseband unit coupled through an optical fiber link; The radio frequency unit is used for obtaining a received signal from an air interface, obtaining a transmitted signal from the baseband unit through the optical fiber link, obtaining a feedback signal used for nonlinear compensation of the transmitted signal, adjusting a baud rate of the feedback signal to obtain a mergable signal, merging the mergable signal and the received signal to obtain an aggregated signal, and transmitting the aggregated signal through the optical fiber link, wherein a frequency zero point of the mergable signal overlaps with a frequency point of the received signal. The baseband unit is configured to acquire the aggregate signal from the radio frequency unit through the optical fiber link, divide the aggregate signal into a first path signal and a second path signal, acquire the feedback signal based on the first path signal, and acquire the received signal based on the second path signal.

6. The system of claim 5, wherein, A frequency zero point of the feedback signal is located at N times of a baud rate, where N is an integer greater than or equal to 1. The radio frequency unit is specifically configured to: Adjust a baud rate of the feedback signal to N times of a frequency point of the received signal, to obtain the fusible signal.

7. The system of claim 5 or 6, wherein, The radio frequency unit is coupled with a serial deserializer, a low noise amplifier, and a combiner, and the serial deserializer, the low noise amplifier, and the optical fiber link are respectively coupled with the combiner. The radio frequency unit is specifically configured to: Adjust the baud rate of the feedback signal through the serial deserializer to obtain the fusible signal, and transmit the fusible signal to the combiner; Transmit the received signal to the combiner through the low noise amplifier; Merge the fusible signal output by the serial deserializer and the received signal output by the low noise amplifier into an aggregate signal through the combiner, and transmit the aggregate signal to the optical fiber link.

8. The system of any one of claims 5 to 7, wherein, The baseband unit is coupled with a first filter module, a second filter module, and a branching module, and the first filter module and the second filter module are respectively coupled with the branching module. The baseband unit is specifically configured to: Divide the aggregate signal into a first path signal and a second path signal through the branching module; Transmit the first path signal to the first filter module for processing to obtain the feedback signal; Transmit the second path signal to the second filter module for processing to obtain the received signal.

9. An optical wireless communication method, characterized by, The method comprises: Acquiring a feedback signal from a radio frequency unit, the feedback signal being used for nonlinear compensation of a transmission signal from a baseband unit, the radio frequency unit being coupled with the baseband unit through an optical fiber link, and the optical fiber link being used for transmitting a received signal from the radio frequency unit to the baseband unit; Adjusting a baud rate of the feedback signal to obtain a fusible signal, and merging the fusible signal and the received signal into an aggregate signal, where a frequency zero point of the fusible signal overlaps with a frequency point of the received signal; Transmitting the aggregate signal to the baseband unit through the optical fiber link, the aggregate signal being used for the baseband unit to acquire the feedback signal and the received signal.

10. The method of claim 9, wherein, A frequency zero point of the feedback signal is located at N times of a baud rate, where N is an integer greater than or equal to 1. The adjustment of the baud rate of the feedback signal to obtain the fusible signal comprises: Adjusting the baud rate of the feedback signal to N times of the frequency point of the received signal to obtain the fusible signal.

11. The method according to claim 9 or 10, characterized in that, The adjustment of the baud rate of the feedback signal to obtain the fusible signal comprises: Adjusting the baud rate of the feedback signal through a serial deserializer to obtain the fusible signal. The merging of the fusible signal and the received signal into the aggregate signal comprises: combining the fusible signal from the serial deserializer and the received signal into one aggregated signal through a combiner.

12. An optical wireless communication method, characterized by, The method comprises: acquiring an aggregated signal from a radio frequency unit through an optical fiber link, the aggregated signal being one signal obtained by combining a received signal acquired by the radio frequency unit from an air interface and a fusible signal, the frequency zero point of the fusible signal overlapping with the frequency point of the received signal, the fusible signal being a signal obtained by adjusting the baud rate of a feedback signal from the radio frequency unit, the feedback signal being used for nonlinear compensation of a transmission signal from a baseband unit; dividing the aggregated signal into a first signal and a second signal; based on the first signal, acquiring the feedback signal, and based on the second signal, acquiring the received signal.

13. The method of claim 12, wherein, The dividing the aggregated signal into a first signal and a second signal comprises: dividing the aggregated signal into a first signal and a second signal through a branching module; The acquiring the feedback signal based on the first signal and the received signal based on the second signal comprises: processing the first signal through a first filtering module to obtain the feedback signal; processing the second signal through a second filtering module to obtain the received signal.

14. An optical wireless communication method, characterized by, The method comprises: acquiring a received signal and a feedback signal, the received signal being a signal from an air interface, the feedback signal being used for nonlinear compensation of a transmission signal from a baseband unit acquired from an optical fiber link; adjusting the baud rate of the feedback signal to obtain a fusible signal, the frequency zero point of the fusible signal overlapping with the frequency point of the received signal; combining the fusible signal and the received signal to obtain one aggregated signal, and transmitting the aggregated signal to the baseband unit through the optical fiber link; dividing the aggregated signal into a first signal and a second signal, the first signal being used for providing the feedback signal to the baseband unit, and the second signal being used for providing the received signal to the baseband unit.

15. A chip, characterized by comprising one or more processors; when the processor processes data and / or information, the method of any one of claims 9 to 14 is implemented. comprising one or more processors; when the processor processes data and / or information, the method of any one of claims 9 to 14 is implemented.

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